***Harken PowerSeats Require Certification to Purchase. If you are not already certified for the use of the Harken PowerSeat, you must be certified prior to receiving the product. We offer the training and certification at our offices in Mount Pleasant, South Carolina, if required. If you are currently certified by Harken for the use of the PowerSeat, please submit proof of your certification with your purchase and your order will be processed for shipment. For orders that will be picked up in South Carolina, 9% sales tax will be charged. A 3% discount will be given for orders paid by check. We can also ship the unit directly to your state following training; in this case, South Carolina sales tax will not be charged.